Efficient fertilizer use in acid upland soils of the humid tropics
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Acid upland soils account for about half the land area of the tropics and for a very high proportion of the undeveloped land potentially available for arable cropping. Most of these soils are at present under virgin rain forest, with smaller areas under anthropic savanna, tree crops and shifting cultivation. The main reason for lack of development of these soils is that a high standard of management and costly inputs are needed to bring them into permanent arable cropping.